Title :
Single-stage CMOS OTA for active-RC filter design
Author :
Khumsat, Phanumas ; Worapishet, Apisak ; Sirisuk, Phaophak
Author_Institution :
Prince of Songkla Univ., Hat-Yai
Abstract :
Single-stage operational transconductance amplifier is proposed for OTA-RC filter design. The concept is developed from a resistive source-degeneration long-tail pair where large transconductance is obtained by utilising negative resistance as a degeneration resistor. Such single-stage structure poses obvious advantage in consuming small current consumption compared to conventional two-stage OTA. Functionality of the proposed OTA has been confirmed by simulation of a complex 5th-order Chebyshev channel-select filter in O.tSmum CMOS process with centre frequencies of 1MHz and 2MHz for Bluetooth and ZigBee applications with respective in-band SFDR of 58dB and 54dB while draining static current consumption less than 450muA from 1.5-V supply. The proposed OTA concept has also been experimentally verified with MOS transistor arrays implementation.
Keywords :
CMOS integrated circuits; Chebyshev filters; RC circuits; active filters; channel bank filters; low-power electronics; operational amplifiers; Chebyshev channel-select filter; MOS transistor array; active-RC filter design; degeneration resistor; frequency 1 MHz; frequency 2 MHz; negative resistance; operational transconductance amplifier; resistive source-degeneration; single-stage CMOS OTA; size 0.18 mum; static current consumption; Bluetooth; CMOS process; Chebyshev approximation; Filters; Frequency; MOSFETs; Operational amplifiers; Resistors; Transconductance; ZigBee;
Conference_Titel :
Communications, 2007. APCC 2007. Asia-Pacific Conference on
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-1374-4
Electronic_ISBN :
978-1-4244-1374-4
DOI :
10.1109/APCC.2007.4433500
